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United States Patent |
6,131,820
|
Dodd
|
October 17, 2000
|
Discharge valve assembly for trigger sprayer
Abstract
A trigger actuated pump sprayer has a discharge valve assembly located in
the discharge barrel of the pump body which includes a filler for reducing
the volume of the discharge barrel thereby displacing the air therein
whereupon the strokes-to-prime ratio of the pump required during initial
pumping for discharging pressurized liquid along the barrel and through
the orifice at a nozzle end thereof, is improved. Also the discharge valve
assembly may be shiftable along the length of the discharge barrel in
response to pressure and return strokes during pumping, a downstream end
of the assembly engaging a spin mechanics element at the nozzle end to
therewith define a variable volume suction chamber in communication with
the discharge orifice for withdrawing product therefrom during each
pumping suction stroke.
Inventors:
|
Dodd; Joseph K. (Lee's Summit, MO)
|
Assignee:
|
Calmar Inc. (City of Industry, CA)
|
Appl. No.:
|
323160 |
Filed:
|
June 1, 1999 |
Current U.S. Class: |
239/106; 239/333; 239/492 |
Intern'l Class: |
B05B 015/02; B05B 009/043; B05B 001/34; F23D 011/34; A62C 011/00 |
Field of Search: |
222/383.1
239/106,119,333,492
|
References Cited
U.S. Patent Documents
Re33235 | Jun., 1990 | Corsette | 222/383.
|
4527741 | Jul., 1985 | Garneau | 239/333.
|
4706888 | Nov., 1987 | Dobbs | 239/478.
|
4958754 | Sep., 1990 | Dennis | 222/383.
|
5114052 | May., 1992 | Tiramani et al. | 239/333.
|
5181658 | Jan., 1993 | Behar | 239/493.
|
5234166 | Aug., 1993 | Foster et al. | 239/333.
|
5509608 | Apr., 1996 | Foster et al. | 239/333.
|
5518147 | May., 1996 | Peterson et al. | 222/153.
|
5535950 | Jul., 1996 | Barraic et al. | 239/333.
|
5593093 | Jan., 1997 | Foster et al. | 239/333.
|
5711459 | Jan., 1998 | Glynn | 239/333.
|
5785208 | Jul., 1998 | Dobbs et al. | 222/148.
|
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Hwu; Davis
Attorney, Agent or Firm: Dykema Gossett PLLC
Claims
What is claimed is:
1. A trigger actuated prump sprayer comprising, a pump body having a
cylindrical discharge barrel in communication with a variable volume pump
chamber defined by a manually reciprocalable piston operating between
pressure and return strokes within a pump cylinder of said body for
discharging liquid product through a discharge orifice at a downstream end
of said barrel, a spin mechanics element fixed at said downstream end, a
discharge valve assembly slidably disposed within said barrel and
including an elastomeric circular valve disc and means engaging said spin
mechanics element to therewith define a variable volume suction chamber,
said valve disc being in sealing engagement along its outer periphery with
an inner wall of said barrel in a valve closed condition during the piston
return strokes to prevent the passage of liquid product from said
discharge barrel to said pump chamber, at least a portion of said outer
periphery disengaging said inner wall in a valve open condition during the
piston pressure strokes to permit the passage of liquid product under
pressure through said discharge orifice, said valve assembly being
slidably movable along said discharge barrel toward and away from said
spin mechanics element respectively during said valve open and valve
closed conditions, said suction chamber being expanded during the movement
away from said element for retracting liquid product inwardly of said
discharge orifice to avoid any formation of dribbles and drips thereat.
2. The pump sprayer according to claim 1, further comprising a filler
member disposed within said discharge barrel for substantially reducing
the volume thereof and defining a discharge passage in communication with
said orifice to reduce volume of liquid product within said barrel during
pumping operation.
3. The pump sprayer according to claim 1, wherein said means of said valve
assembly comprises a rod slidable within a cupped depression in said
element for defining said suction chamber.
4. The pump sprayer according to claim 3, wherein spring means are provided
in said suction chamber for biasing said rod away from said element.
5. The pump sprayer according to claim 1, wherein said discharge valve is
located at an upstream end of said barrel.
6. The pump sprayer according to claim 2, wherein said discharge valve is
located at an upstream end of said passage, said means on said valve
assembly comprises a rod, and said filler member comprising a sleeve
surrounding said rod and therewith defining said discharge path.
7. The pump sprayer according to claim 6, wherein means is provided on said
rod for axially spacing said sleeve away from said valve to avoid
interference in the valve open condition.
8. The pump sprayer according to claim 1, wherein said discharge valve is
located adjacent said downstream end of said barrel.
9. The pump sprayer according to claim 2, wherein said discharge valve is
located adjacent said downstream end of said passage, said means of said
valve assembly comprising a rod, and said filler member comprising a
sleeve surrounding said rod and therewith defining said discharge passage.
10. The pump sprayer according to claim 9, wherein said rod extends to an
upstream end of said passage.
11. The pump sprayer according to claim 5, wherein said means of said valve
assembly comprises an elongated member having an enlarged section for
substantially filling said barrel to reduce volume of liquid product
within said barrel during pumping operation.
12. The pump sprayer according to claim 1, wherein said valve comprises a
conical valve sloping in a downstream direction.
13. The pump sprayer according to claim 1, wherein said valve has a concave
side facing in an upstream direction.
14. A discharge valve assembly adapted for use in a trigger operated pump
sprayer to be mounted on a liquid container, the sprayer having a pump
body including a discharge barrel and a pump for discharging liquid
product from the container through the barrel and from a discharge orifice
at a downstream end of the barrel, the valve assembly comprising a
flexible valve disc of greater diameter than the diameter of said barrel
to resiliently engage the inner wall of said barrel in a valve closed
position and to disengage said inner wall in a valve open position, said
assembly further comprising means defining spin mechanics fixed at said
downstream end and support means for said spin mechanics means and said
valve disc, said support means extending between an upstream end of said
barrel and said downstream end, said support means having means
substantially reducing the volume of said passage while maintaining a
discharge passage toward said orifice to reduce volume of liquid product
within said passage during pumping operation.
15. The valve assembly according to claim 14, wherein said valve disc is
located at said upstream end.
16. The valve assembly according to claim 15, wherein said support means
comprises a rod movable along said passage in response to pressure and
suction strokes applied during pumping, said rod engaging a cavity in said
spin mechanics means to therewith define a variable volume suction chamber
during rod movement for retracting liquid product from said orifice during
pumping to avoid formation of dribbles and drips thereat.
17. The valve assembly according to claim 14, wherein said volume reducing
means comprises a sleeve member surrounding on said support means.
18. The valve assembly according to claim 15, wherein said support means
comprises a rod, and said volume reducing means comprises a hollow tube
surrounding said rod.
19. The valve assembly according to claim 14, wherein said valve disc is
located adjacent said spin mechanics means.
20. The valve assembly according to claim 14, wherein said support means
comprises a cylindrical member with which said spin mechanics means is
integrally formed, said cylindrical member having an outer diameter
slightly less than the barrel diameter for defining said volume reducing
means.
21. The valve assembly according to claim 14, wherein said valve disc
comprises a frusto-conical valve skirt sloping toward said inner wall in a
downstream direction.
22. The valve assembly according to claim 14, wherein said support means
comprises a cylindrical member coupled to said spin mechanics means, said
cylindrical member having a diameter size relative to said barrel to
define said volume reducing means.
23. The valve assembly according to claim 22, wherein said valve disc is
integrally formed with said cylindrical member.
24. The valve assembly according to claim 14, wherein said support means
comprises a rod coupled to said spin mechanics means, said rod having an
enlarged section defining said volume reducing means.
25. The valve assembly according to claim 16, wherein said rod has an
enlarged section defining said volume reducing means.
26. The valve assembly according to claim 14, wherein said valve disc is
located between said upstream and downstream ends.
27. The valve assembly according to claim 26, wherein said support means
comprises a cylindrical member formed integrally with said spin mechanics
means.
28. The valve assembly according to claim 14, wherein said support means
comprises a cylindrical member to which said valve disc is mounted
adjacent said spin mechanics means, and an extender for coupling said spin
mechanics means to said cylindrical member.
29. The valve assembly according to claim 28, wherein said cylindrical
member has a diameter sized to the diameter of said inner wall as to
comprise said volume reducing means.
30. The valve assembly according to claim 14, wherein said support means
comprises a cylindrical member and an extender for coupling said spin
mechanics means to said cylindrical member, said valve disc being formed
integrally with said extender.
31. The valve assembly according to claim 14, wherein said support means
comprises a cylindrical member coupled to said spin mechanics means, and a
peg on said pump body coupled to said cylindrical member, said valve disc
being mounted to said peg.
32. A discharge valve assembly adapted for use with a pump sprayer to be
mounted on a liquid container, the sprayer having a pump body including a
discharge barrel having a discharge orifice at a downstream end thereof,
the valve assembly comprising a flexible valve disc having an outer
peripheral edge in sealing engagement with an inner wall of said barrel in
a valve closed position, means comprising spin mechanics fixed at said
downstream end, and a filler member disposed in said barrel extending
substantially between an upstream end of the barrel and said spin
mechanics means for reducing volume of the liquid product within the
barrel during operation of the pump sprayer, said filler member defining a
discharge passage for the discharge of liquid product from the orifice.
33. The discharge valve assembly according to claim 32, wherein the valve
is connected to the spin mechanics means for movement along the length of
the barrel during pump operation.
34. The discharge valve assembly according to claim 32, wherein the valve
disc is of flexible material.
35. The discharge valve assembly according to claim 33, wherein the valve
is located adjacent the upstream end of the barrel.
36. The discharge valve assembly according to claim 33, wherein the valve
is located adjacent the downstream end of the barrel.
37. The discharge valve assembly according to claim 32, wherein the filler
member interconnects the spin mechanics means with the valve.
38. The discharge valve assembly according to claim 37, wherein the valve
is located adjacent the upstream end of the barrel.
39. The discharge valve assembly according to claim 37, wherein the valve
is located adjacent the downstream end of the barrel.
40. The discharge valve assembly according to claim 37, wherein the valve
is located between said upstream and downstream ends.
41. A discharge valve assembly adapted for use with a pump sprayer to be
mounted on a liquid container, the sprayer having a pump body including a
discharge barrel defining a discharge passage having a discharge orifice
at a downstream end thereof, the valve assembly comprising a flexible
valve disc having an outer peripheral edge in sealing engagement in a
valve closed condition with an inner wall of said barrel defining a valve
seat, said peripheral edge disengaging said inner wall in a valve open
condition, means comprising spin mechanics fixed at said downstream end,
said valve assembly further comprising a rod member on which said disc is
mounted and which lies along a central axis of said barrel, said rod
member engaging a depression formed in said means to therewith define a
variable volume suction chamber, said valve assembly being disposed for
sliding movement within said passage toward said means during the valve
open condition and away from said means during the valve closed condition,
said suction chamber being expanded during the movement away from said
means for retracting liquid product inwardly of said orifice.
42. The discharge valve assembly according to claim 41, wherein the valve
disc is located adjacent an upstream end of the barrel.
43. The discharge valve assembly according to claim 41, wherein the valve
disc is located adjacent said spin mechanics means.
44. The discharge valve assembly according to claim 41, wherein the valve
disc is of flexible material.
45. The discharge valve assembly according to claim 41, wherein spring
means are located in said suction chamber for biasing said rod member away
from said orifice.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to a discharge valve assembly for a
trigger actuated pump sprayer, and more particularly to such a valve
assembly as having a product retraction feature to avoid the formation of
dribbles and drips of liquid product at the discharge orifice when in use.
Another feature of the invention provides for reducing the volume of the
discharge passage leading from the pump chamber to the discharge orifice
to aid in pump priming.
Trigger actuated pump sprayers are known to have certain basic features,
namely, a trigger actuated piston operating in a rump cylinder, a valve
controlled inlet leading to the pump chamber, and a valve controlled
discharge leading away from the chamber. During each piston return stroke,
the internal pump pressure falls below atmospheric as the pump chamber
volume expands to thereby induce the flow of liquid product into the
chamber from the container through the inlet via an unseated inlet check
valve. The pump chamber is thus charged (or primed) and recharged with
liquid product during each suction stroke. And during induction of the
product the discharge check valve is drawn closed against its valve seat
to both seal the discharge closed and to facilitate pump priming. During
each pressure stroke product is discharged from the pump chamber thereby
sealing the inlet closed as the inlet check valve is forced against its
valve seat, while applying pressure against the discharge check valve to
move it from its valve seat to thereby open the discharge to the orifice
at the exit end thereof. Examples of the known pump sprayers are: Model
No. TS-800 manufactured by Calmar Inc.; U.S. Pat. No. RE 33,235;
4,527,741; 5,234,166; and 5,509,608.
Oftentimes residual product in the discharge passage leading to the exit
opening tends to accumulate at the discharge orifice after the closing of
the discharge valve thereby forming dribbles and drips (product drooling)
at the orifice, which is undesirable.
The trigger sprayer is typically structured as having a relatively long
discharge barrel leading from the pump chamber to the discharge orifice at
the nozzle end thereof. The discharge barrel defining the discharge
passage is formed integrally with the pump body during the molding
operation and is thus sized sufficiently to facilitate ease in molding.
The diameter and length of the discharge passage, however, provides a
volume which fills with product during the pumping operation and remains
substantially filled during use. When the pump chamber is primed liquid
product is drawn into the pump chamber during each return stroke
incrementally and is discharged from the chamber during each pressure
stroke into the discharge flow path which extends between the outlet from
the pump chamber to the discharge orifice. During the initial pressure
strokes the discharge path is gradually filled with product and it is the
strokes-to-prime ratio which is one of several factors determining pump
performance.
The volume reduction of the discharge passage has been found a factor in
reaching an acceptable strokes-to-prime ratio, as less volume is required
to be occupied by product during the initial pressure strokes, thereby
effecting an earlier discharge through the orifice.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an improved
discharge valve assembly for a trigger actuated pump sprayer having an
anti-drool feature. For this purpose a suction chamber is defined between
a slidable valve assembly and a spin mechanics element fixed at the nozzle
end of the discharge barrel, the suction chamber communicating with the
discharge orifice. The valve assembly reciprocates during pressure and
return strokes to not only valve product toward the discharge orifice, but
to reciprocate in the discharge barrel for suctioning product inwardly of
the discharge orifice to avoid the formation of dribbles and drips
thereat.
Otherwise the discharge valve assembly may be stationary within the
discharge barrel, and a discharge passage volume reducer is provided to
restrict the accumulation of product within the passage to thereby aid in
pump priming. The volume reducer may be in the form of a sleeve or a
cylinder or the like. The valve assembly includes an elastomeric circular
valve disc in sealing engagement along its outer periphery with an inner
wall of the discharge barrel in the valve closed condition, at least a
portion of such outer periphery disengaging the inner wall in a valve open
condition.
The discharge passage volume reducer may likewise be provided for that
embodiment of the invention which includes a longitudinally slidable valve
assembly provided to withdraw product inwardly of the discharge orifice.
Other objects, advantages and novel features of the invention will become
more apparent from the following detailed description of the invention
when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional view of a trigger actuated pump sprayer
incorporating both an anti-drool feature and a pump priming aid according
to the invention;
FIG. 1A is a partial view similar to that of FIG. 1 of a modification of
the anti-drool feature; and
FIGS. 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 are vertical sectional views
similar to that of FIG. 1 of variations of both embodiments of the
invention.
DETAILED DESCRIPTION OF THE INVENTION
Turning now to the drawings wherein like reference characters refer to like
and corresponding parts throughout the several views, a manually actuated
pump dispenser incorporating the invention is generally designated 20 in
FIG. 1 as comprising a pump body 21 adapted to be mounted to the neck of a
container 22 of liquid product to be dispensed, utilizing an internally
threaded closure cap 23. A snap closure could (not shown) otherwise be
provided for mounting the pump body or the container, or the pump body
could be mounted to the container neck utilizing a bayonet-type fitment
(not shown).
The pump body includes an inlet passage 24 defined by an upstanding
cylindrical portion 25 of the pump body which suspends a conventional dip
tube 26 immersed at its free end in liquid product (not shown) in the
container, the dip tube being suspended by tight frictional engagement
with the inner wall of portion 25. The dip tube may be otherwise suspended
from portion 25 in any known manner.
The pump body likewise includes a pump (cylinder 27 for the reception of a
manually reciprocable pump piston 28 having an inboard annular piston seal
29 defining together with the pump cylinder a variable volume pump chamber
31. An inlet ball check valve 30 or the like is provided for valving the
inlet in any known manner. A piston return spring 32 is provided, which
may be internally of the pump chamber as shown or which may be external to
the pump chamber (not shown), for returning the piston to its FIG. 1
position after each pressure stroke. A trigger actuator 33 is pivotally
mounted on the pump body, the trigger having a projection 34 engaging an
outer edge of the piston for reciprocating the piston upon each pull of
the trigger against the force of return spring 32. The piston may likewise
have an outboard annular vent seal 35 in sealing engagement with the inner
wall of the pump cylinder outboard of a longitudinal rib or ribs 36 on the
inner wall for breaking the seal during piston reciprocation to open vent
port 37 to atmosphere to thereby vent the interior of the container. See
RE33,235 for a detailed disclosure of the aforedescribed trigger sprayer.
Cylindrical portion 25 has a port 38 through which liquid product enters
and exits the pump chamber, the port communicating via an opening 39 with
a substantially horizontal discharge barrel 41 through which liquid
product passes, the terminal end of barrel 41 defining a nozzle 42.
A nozzle cap 43 having a discharge orifice 44 provided in its front wall
45, is snap-fitted as at 46 to nozzle 42 for rotation without axial
movement between on and off positions. The cap has an inner cylindrical
sleeve 47 with internal longitudinal passages, the sleeve surrounding a
spin mechanics element 48 mounted within nozzle 42, element 48 having
circumferentially spaced apart ears 49, one of which engages a detent 51
for snap fitting element 48 in place against rotation. A stop shoulder 50
or the like may be provided internally of the barrel for mounting the spin
mechanics element against axial movement.
The front wall of element 48 defines a spin chamber 52 as having a
plurality of tangential and radial grooves extending between that chamber
and longitudinal grooves provided on the outer wall of element 48. Upon
rotation of nozzle cap 43, the internal grooves within sleeve 47 and the
external grooves on element 48 match or mismatch for opening and closing
the discharge orifice, all as described in detail in commonly owned U.S.
Pat. No. 4,706,888, the entire disclosure of which being incorporated
herein by reference. And, the pump body may be covered with a shroud 53
snapped or otherwise mounted thereto in some normal manner.
A discharge valve assembly 54 is located within barrel 41, the assembly
including an elastomeric circular valve disc 55 in sealing engagement
along its outer periphery with inner wall 56 of barrel 41. The valve which
may be frusto-conical as shown, has an outer diameter slightly greater
than the inner diameter of wall 56 as to inherently provide a biasing
action of the valve against wall 56. The conical valve is sometimes
referred to as a chevron valve.
Assembly 54 is disposed within discharge barrel 41 for longitudinal
shifting movement therealong, the assembly further including support means
for the valve and the spin mechanics element which may be in the form of
an elongated cylindrical rod 57 with which valve 55 may be integrally
molded.
Spin mechanics element 48 has a central, cylindrical depression 58 (FIG.
1A) which may be either slightly oversized relative to the diameter size
of rod 57, or which may have one or more longitudinal grooves formed on
its inner wall. The downstream end of rod 57 extends into depression 58
and therewith defines a variable volume suction chamber 59 in open
communication with orifice 44 in the discharge open rotative position of
the nozzle cap.
A hollow sleeve 61 may surround rod 57, the inner diameter of the sleeve
being slightly greater than the diameter of rod 57 to the-with define an
annular discharge passage 62. Sleeve 61 functions as a means for reducing
the volume of discharge barrel 41 for a purpose to be explained more fully
hereinafter. And, one or more longitudinal ribs 63 or the like may be
provided on rod 57 adjacent valve 55, the ribs acting as spacers for
sleeve 61 to maintain the sleeve axially spaced from the valve to avoid
any interference during valve opening.
In operation, assuming that pump chamber 31 is primed with liquid product,
each inward (pressure) stroke applied to the piston upon each pull of the
trigger increases the pressure of the liquid at the upstream side of valve
55 causing at least a portion of the valve periphery to disengage from
inner wall 56 to thereby open the discharge permitting liquid under
pressure to flow through passage 62 and out through orifice 44 as a spray
or a stream depending on the manual setting of nozzle cap 43. Pressurized
product from the pump chamber acting against the upstream face of valve 55
likewise causes the entire valve assembly 54 to longitudinally shift in a
downstream direction whereupon rod 57 reciprocates within depression 58
thereby evacuating chamber 59 of any fluid. Upon relaxation of the manual
force applied against the trigger, the pump piston shifts outwardly of its
cylinder bore under the influence of the force of return spring 32 as in
any normal manner, to thereby expand pump chamber 31 which functions to
draw liquid up the dip tube and into the pump chamber via the unseated
valve check ball 30 and port 38. This sub-atmospheric pressure created by
the expanding pump chamber likewise causes valve 55 to tightly reseal
against inner wall 56 by reason of the pressure differential existing on
opposite sides of the valve. The closing of the discharge valve permits
the pump chamber to be primed as aforedescribed. And the sub-atmospheric
pressure created at the upstream side of valve 55 causes rod 57 to
reciprocate upstream n a direction outwardly of chamber 59 to thereby
create a sub-atmospheric condition therein for suctioning any residual
product from orifice 44 to avoid the formation of dribbles and drips
thereat.
During each pressure stroke of the piston product flows into and through
discharge barrel portion 41 before discharging out of the orifice in the
form of a spray or a stream, depending on the setting of the discharge
nozzle. Without the inclusion of sleeve 61, the volume of barrel 41 is
significantly greater, and this volume is initially air filled before pump
priming such that the liquid product displaces the air gradually during
each initial pressure stroke. The strokes-to-prime ratio experienced
during initial pumping without the provision of a volume reducer, has been
shown to be higher than acceptable.
The provision of sleeve 61, surrounding rod 57, significantly reduces the
volume of discharge barrel 41 and defines a thin, annular discharge
passage 62 together with the rod. Sleeve 61 therefore functions as a
priming aid as it displaces the air in barrel 41, such that a reduced
volume of air must be initially displaced by the liquid product, as it
passes through the discharge during the initial pressure strokes. It has
been shown that with the provision of the volume reducer the
strokes-to-prime ratio drops to a more acceptable level.
As mentioned earlier, during each piston return stroke, the valve assembly
retracts as it shifts slightly rearwardly in an upstream direction to
thereby expand suction chamber 59. The expanding chamber, being in open
communication with discharge orifice 44, functions to retract product into
and behind the orifice which may collect outwardly of the orifice in the
form of product dribbles or drips, to therefore provide an anti-drooling
effect.
A light spring 64 of some type, FIG. 1A, may be provided in suction chamber
59 between the bottom wall of the chamber and the front wall of rod 57,
for assisting in retracting the discharge valve assembly to cause it to
shift outwardly of chamber 59 during each piston return stroke. The spring
64 may be in the form of a coil spring, a leaf spring, or any equivalent
light spring, without departing from the invention.
FIGS. 2 to 11 show various modifications of the discharge valve assembly
according to the invention. For example, discharge valve assembly 65 of
FIG. 2 is similar to valve assembly 54 of FIG. 1 in that they both include
rod 57 as having an integrally molded conical valve disc 55 which is
spring biased under its own resiliency along its periphery which bears
against inner wall 56 of barrel 41. And, valve assembly 65 is movable
longitudinally within cylindrical depression 58 of spin mechanics element
48 to therewith define the variable volume suction chamber 59 as described
in detail with reference to FIG. 1.
A hollow sleeve 61 surrounds rod 57 and therewith defines an annular
discharge passage 62 through which liquid product under pressure during
pumping passes and applies pressure against the upstream side of valve 55
to both deform the valve into an open position and to shift the valve
assembly downstream, causing the tip of the rod to reciprocate within
chamber 59. Valve assembly 65 and volume reducer 61 function in the same
manner as described with reference to FIG. 1. As seen in FIG. 2, the main
difference between valve assembly 54 and valve assembly 65 is that in the
latter the valve disc is located further downstream in barrel 41 as
compared to the upstream location of disc 55 in FIG. 1.
Discharge valve assembly 66 in the FIG. 3 embodiment comprises a combined
filler in the form of a tubular portion 67 integral With spin mechanics
element 48, which is otherwise identical to that described with reference
to FIG. 1. Assembly 66 is fixed within cylindrical portion 41 as one of
its ears 49 is snap-fitted to detent 51. And the assembly may include a
separate valve element 68 on which conical valve 55 is formed, the valve
being seated along its outer periphery against inner wall 56 for closing
discharge passage 62 formed between the outer diameter of tubular portion
67 and the inner diameter of cylindrical portion 41. Valve element 68 may
be simply telescoped within the open end of portion 67 in frictional
engagement with the wall at the inner diameter thereof.
Discharge valve assembly 69 of the FIG. 4 embodiment comprises a hollow
tubular section 71 fixed within discharge barrel 41, such as by frictional
engagement with a peg 72 provided on pump body 21, the discharge valve
assembly further including an integral rod portion 73 fixed to a separate
spin mechanics element 48 upon frictional engagement with the wall of
depression 58 thereof. Conical valve disc 55 may be formed integrally with
rod portion 73, shown seated in place as its outer periphery seals against
the inner wall 56 of portion 41. Discharge passage 62 is established
between the outer diameter of section 71 and the inner diameter of barrel
41, such that liquid product under pressure passing therethough bears
against the upstream side of valve disc 55 causing it to deform and at
least a portion thereof to move away from its valve seat to thereby open
the discharge to the discharge orifice.
In the FIG. 5 embodiment, discharge valve assembly 74 is, as discharge
valve assemblies 54 and 65 of FIGS. 1 and 2, mounted within discharge
barrel 41 for longitudinal shifting movement so as to provide a similar
anti-drool feature. The assembly includes a rod 57 engageable with the
wall of cylindrical depression 58 of spin mechanics 48 to therewith define
variable volume suction chamber 59 to effect product retraction at the
discharge orifice as in the manner and for the purpose as described with
reference to FIG. 1. Rod 57 has at its upstream end an integral conical
valve 55 which, as in the foregoing embodiments, has its outer peripheral
edge in sealing engagement with the inner wall 56 of portion 41 for
closing discharge passage 62. Also valve assembly 74 includes along the
length of its rod 57 a plurality of spaced integral circular discs 75 or
the like which function as a filler to reduce the volume within barrel 41
to thereby function in the same or similar manner as filler elements 61,
71 and 61 as aforedescribed. Discharge valve assemble 74 shifts in a
downstream direction during each pressure stroke which supplies product
under pressure against the upstream side of valve disc 55 thereby
deforming at least a portion of that disc for opening discharge passage 62
and for likewise effecting a longitudinal shift of the assembly within
barrel 41 to thereby provide an anti-drool feature. The valve assembly
retracts during each suction stroke of the piston as the pressure on the
upstream side of valve disc 55 is below atmospheric relative to the
pressure on the downstream side thereof, to thereby retract rod 57 out of
cylindrical depression 58. As in the FIG. 1 embodiment, a light return
spring 64 of some selected type can be provided to assist in the
retraction process of the valve assembly.
Discharge valve assembly 76 of the FIG. 6 embodiment includes a hollow
tubular section 77 in frictional engagement with spin mechanics element 48
so as to be thereby fixed within discharge barrel 41. A discharge valve
disc 78, of flexible, elastomeric material, is deformed when assembled
within barrel 41 such that it assumes a concave shape as shown which
possess an inherent biasing capacity as its outer peripheral edge
sealingly engages against inner wall 56 out barrel 41 for valving
discharge passage 62. The valve disc may be mounted in place by the
provision of a central opening 79 therein through which a pin 81 on the
pump body extends. Section 77 may engage the pin as shown, or the pin may
be provided on section 77 and be extended through central opening 79 of
the valve disc for stabilizing the same within barrel 41.
Discharge valve assembly 82 of the FIG. 7 embodiment is fixed within barrel
41 as an ear 49 on spin mechanics element 48 engages detent 51. The
assembly includes a downstream tubular section 83 formed integrally with
element 48, and an upstream sleeve 84 fixed in place by frictional
engagement with peg 72. A valve element 85 carrying conical discharge
valve 55 interconnects section 83 and sleeve 84 as it frictionally engages
the interior hollow ends thereof as shown. Discharge passage sections 62
are established between the inner diameter of barrel 41 and the outer
diameters of sleeve 84 and of tubular section 83 respectively. As shown
conical valve 55 is substantially intermediate the upstream and downstream
ends of barrel 41, as compared to the locations of the discharge valves in
the foregoing embodiments. Valve 55 functions similarly as described above
for valving product through the discharge passage, and elements 83, 84 of
the discharge valve assembly function as filler elements for reducing the
volume of barrel 41 as for the purpose and in the manner as described with
reference to FIG. 1.
In the FIG. 8 embodiment discharge valve assembly 86 includes filler
element in the form of a tubular section 87 fixed within portion 41 as it
frictionally engages with peg 72. Discharge valve disc 78, which may be of
The same or similar type as described with reference to FIG. 6, is mounted
via its central opening on pin 81 at the downstream end of section 87.
And, the valve assembly includes a hollow tubular extender 88 engaging pin
81 and cylindrical depression 58 of the spin mechanics element.
Discharge valve assembly 89 of FIG. 9 includes a hollow sleeve 91 fixed to
peg 72 and functioning as a filler element, the sleeve defining together
with the inner wall of barrel 41 a discharge passage 62. Valve element 92
interconnects spin mechanics element 48 with sleeve 91 via frictional
engagement as shown. Conical valve element 55 is formed on element 92
which functions to valve product through the discharge passage similarly
as described with reference to the other embodiments.
Discharge valve assembly 93 in FIG. 10 comprises a tubular element 94 fixed
within cylindrical portion 41 and connected to sp n mechanics element 48
by frictional engagement as shown. The assembly further has a valve
element 95 to which conical valve 55 is integrally molded, the valve
element being fixed to tubular element 94 upon frictional engagement.
Element 94 defines an annular discharge passage 62 together with inner
wall 56, and valve 55 is seated against wall 56 about its annular outer
edge. Element 94 functions as a filler for reducing the volume of
cylindrical portion 41 as for the purpose and functioning in the manner
described with reference to FIG. 1.
Lastly, the FIG. 11 embodiment has a discharge valve assembly 96 which
includes filler element formed as a molded cylinder 97 fixed to peg 72 at
its upstream end, and being supported against valve element 98 which
extends into frictional engagement with spin mechanics element 48. The
valve element includes a conical discharge valve 55 which, as in all other
embodiments, is seated along its outer periphery against inner wall 56 for
valving discharge passage 62 which is defined between cylinder 97 and wall
56.
From the foregoing it can be seen that a variety of discharge valve
assemblies have been provided for a trigger actuated pump sprayer each
having a filler for reducing the volume of the discharge barrel which
displaces a substantial volume of air such that product is discharged
through the discharge barrel more rapidly toward the discharge exit
orifice during the initial pump pressure strokes. The strokes-to-prime
ratio for the pump is therefore improved by a simple measure which may be
require a separate sleeve-like filler or a cylindrical section of the
discharge valve assembly which may take a wide variety of forms. The
discharge valve may be in the form of a conical valve or a disc valve
shaped into a concave face upon assembly, either such valve being seated
along its outer periphery against the confronting inner wall of the
discharge barrel. The valve may be located at a variety of positions along
the length of the barrel.
In addition to the strokes-to-prime ratio improvement, the discharge valve
assemblies according to several embodiments of the invention are shiftable
in an axial direction along the length of the discharge barrel so that a
rod or rod portion as part of the valve assembly slides within a cupped
depression of the spin mechanics element to therewith define a variable
volume suction chamber. That chamber is in fluid communication with the
discharge orifice for thereby drawing or retracting product from and
around the discharge orifice to avoid the formation of product droplets
thereat. Such an anti-drool feature requires no additional parts and is a
simple, yet highly effective means of avoiding the formation of any
product dribbles and drips at the discharge orifice. Of course, the
anti-drool feature can be provided independently of a discharge volume
reducer, without departing from the invention.
Obviously many other modifications and variations of the present invention
are made possible in the light of the above teachings. It is therefore to
be understood that within the scope of the appended claims the invention
may be practiced otherwise than as specifically described.
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